/*! PhotoSwipe Default UI - 4.1.1 - 2015-12-24
* http://photoswipe.com
* Copyright (c) 2015 Dmitry Semenov; */
/**
*
* UI on top of main sliding area (caption, arrows, close button, etc.).
* Built just using public methods/properties of PhotoSwipe.
* 
*/
(function (root, factory) {
	if (typeof define === 'function' && define.amd) {
		define(factory);
	} else if (typeof exports === 'object') {
		module.exports = factory();
	} else {
		root.PhotoSwipeUI_Default = factory();
	}
})(this, function () {

	'use strict';

	var PhotoSwipeUI_Default =
		function (pswp, framework) {

			var ui = this;
			var _overlayUIUpdated = false,
				_controlsVisible = true,
				_fullscrenAPI,
				_controls,
				_captionContainer,
				_fakeCaptionContainer,
				_indexIndicator,
				_shareButton,
				_shareModal,
				_shareModalHidden = true,
				_initalCloseOnScrollValue,
				_isIdle,
				_listen,

				_loadingIndicator,
				_loadingIndicatorHidden,
				_loadingIndicatorTimeout,

				_galleryHasOneSlide,

				_options,
				_defaultUIOptions = {
					barsSize: { top: 40, bottom: 'auto' },
					closeElClasses: ['item', 'caption', 'zoom-wrap', 'ui', 'top-bar'],
					timeToIdle: 4000,
					timeToIdleOutside: 1000,
					loadingIndicatorDelay: 1000, // 2s

					addCaptionHTMLFn: function (item, captionEl /*, isFake */) {
						if (!item.title) {
							captionEl.children[0].innerHTML = '';
							downLoad(captionEl);
							return false;
						}
						captionEl.children[0].innerHTML = item.title;
						downLoad(captionEl);
						return true;
					},
					original: true,		// 下载原图
					closeEl: true,
					captionEl: true,
					fullscreenEl: true,
					zoomEl: true,
					shareEl: true,
					counterEl: true,
					arrowEl: true,
					preloaderEl: true,
					tapToClose: false,
					tapToToggleControls: true,

					clickToCloseNonZoomable: true,
					shareButtons: [
						{ id: 'facebook', label: 'Share on Facebook', url: 'https://www.facebook.com/sharer/sharer.php?u={{url}}' },
						{ id: 'twitter', label: 'Tweet', url: 'https://twitter.com/intent/tweet?text={{text}}&url={{url}}' },
						{
							id: 'pinterest', label: 'Pin it', url: 'http://www.pinterest.com/pin/create/button/' +
								'?url={{url}}&media={{image_url}}&description={{text}}'
						},
						{ id: 'download', label: 'Download image', url: '{{raw_image_url}}', download: true }
					],
					getImageURLForShare: function ( /* shareButtonData */) {
						return pswp.currItem.src || '';
					},
					getPageURLForShare: function ( /* shareButtonData */) {
						return window.location.href;
					},
					getTextForShare: function ( /* shareButtonData */) {
						return pswp.currItem.title || '';
					},

					indexIndicatorSep: ' / ',
					fitControlsWidth: 1200

				},
				_blockControlsTap,
				_blockControlsTapTimeout;
			
			function createXHR(url, $download, target) {
				var $downloadBtn = $download.getElementsByClassName('js-download-btn')[0];
				var total = parseInt(($downloadBtn.innerHTML.match(/\(([^)]*)\)/))[1]);
				var xhr;
				try {
					// Firefox, Opera 8.0+, Safari，IE7+  
					xhr = new XMLHttpRequest();
				} catch (e) {
					// Internet Explorer   
					try {
						xhr = new ActiveXObject("Msxml2.XMLHTTP");
					} catch (e) {
						try {
							xhr = new ActiveXObject("Microsoft.XMLHTTP");
						} catch (e) {
							xhr = null;
						}
					}
				}
				xhr.onprogress = function (event) {
					if (total === 0) {
						return;
					}
					var progress = '';
					progress = '' + Math.round(100 * event.loaded / total / 1024) + '%';
					$downloadBtn.innerHTML = ('下载中 (' + progress + ')');
				}
				xhr.onload = function () {
					if ((xhr.status >= 200 && xhr.status < 300) || xhr.status == 304) {
						$download.style.display = 'none';
						target.src = url;
						target.onload = function () {
							pswp.currItem.src = url;
							pswp.currItem.currLoaded = true;
							var $imgWrap = document.getElementsByClassName('js-img-wrap');
							var $img = document.getElementsByClassName('js-image');
							for (var i = 0, len = $img.length; i < len; i++) {
								if ($img[i].src.indexOf(url) >= 0) {
									$imgWrap[i].setAttribute('href', url);
									var curSize = $imgWrap[i].getAttribute('data-curr-size');
									var curSizeArr = curSize.split('x');
									pswp.currItem.currZoomLevel = pswp.currItem.w * pswp.currItem.initialZoomLevel / parseInt(curSizeArr[0]);
									pswp.currItem.w = parseInt(curSizeArr[0]);
									pswp.currItem.h = parseInt(curSizeArr[1]);
									window.innerWidth;

									$imgWrap[i].setAttribute('data-size', curSize);
									$img[i].setAttribute('src', url);

									var $parent = $img[i].parentNode;
									while ($parent.className.indexOf('js-photos-thumb') < 0) {
										$parent = $parent.parentNode;
									}
									var $parentDownload = $parent.getElementsByClassName('js-download');
									if ($parentDownload.length > 0) {
										$parentDownload[0].remove();
									}
								}
							}
						}
						target.onerror = function () {

						}
					} else {
					}
				};
				xhr.open('get', url, true);
				xhr.send(null);
				return xhr;
			}
			var downLoad = function (captionEl) {
				// 隐藏下载按钮
				var $download = captionEl.getElementsByClassName('js-download');
				if ($download.length > 0) {
					if (pswp.currItem.currLoaded) {
						$download[0].style.display = 'none';
						return;
					}
					framework.bind($download[0], 'pswpTap click', function (e) {
						e.stopPropagation();
						var zoomArr = document.getElementsByClassName('pswp__zoom-wrap');
						for (var i = 0, len = zoomArr.length; i < len; i++) {
							if (zoomArr[i].getAttribute('data-curr')) {
								var target = zoomArr[i].getElementsByClassName('js-pswp__img')[0];
								var newSrc = target.src.replace(/\?tn=\w/g, '');
								createXHR(newSrc, $download[0], target);
							}
						}
					});
				}
			}

			var _onControlsTap = function (e) {
				if (_blockControlsTap) {
					return true;
				}


				e = e || window.event;

				if (_options.timeToIdle && _options.mouseUsed && !_isIdle) {
					// reset idle timer
					_onIdleMouseMove();
				}


				var target = e.target || e.srcElement,
					uiElement,
					clickedClass = target.getAttribute('class') || '',
					found;

				for (var i = 0; i < _uiElements.length; i++) {
					uiElement = _uiElements[i];
					if (uiElement.onTap && clickedClass.indexOf('pswp__' + uiElement.name) > -1) {
						uiElement.onTap();
						found = true;

					}
				}

				if (found) {
					if (e.stopPropagation) {
						e.stopPropagation();
					}
					_blockControlsTap = true;

					// Some versions of Android don't prevent ghost click event 
					// when preventDefault() was called on touchstart and/or touchend.
					// 
					// This happens on v4.3, 4.2, 4.1, 
					// older versions strangely work correctly, 
					// but just in case we add delay on all of them)	
					var tapDelay = framework.features.isOldAndroid ? 600 : 30;
					_blockControlsTapTimeout = setTimeout(function () {
						_blockControlsTap = false;
					}, tapDelay);
				}

			},
				_fitControlsInViewport = function () {
					return !pswp.likelyTouchDevice || _options.mouseUsed || screen.width > _options.fitControlsWidth;
				},
				_togglePswpClass = function (el, cName, add) {
					framework[(add ? 'add' : 'remove') + 'Class'](el, 'pswp__' + cName);
				},

				// add class when there is just one item in the gallery
				// (by default it hides left/right arrows and 1ofX counter)
				_countNumItems = function () {
					var hasOneSlide = (_options.getNumItemsFn() === 1);

					if (hasOneSlide !== _galleryHasOneSlide) {
						_togglePswpClass(_controls, 'ui--one-slide', hasOneSlide);
						_galleryHasOneSlide = hasOneSlide;
					}
				},
				_toggleShareModalClass = function () {
					_togglePswpClass(_shareModal, 'share-modal--hidden', _shareModalHidden);
				},
				_toggleShareModal = function () {

					_shareModalHidden = !_shareModalHidden;


					if (!_shareModalHidden) {
						_toggleShareModalClass();
						setTimeout(function () {
							if (!_shareModalHidden) {
								framework.addClass(_shareModal, 'pswp__share-modal--fade-in');
							}
						}, 30);
					} else {
						framework.removeClass(_shareModal, 'pswp__share-modal--fade-in');
						setTimeout(function () {
							if (_shareModalHidden) {
								_toggleShareModalClass();
							}
						}, 300);
					}

					if (!_shareModalHidden) {
						_updateShareURLs();
					}
					return false;
				},

				_openWindowPopup = function (e) {
					e = e || window.event;
					var target = e.target || e.srcElement;

					pswp.shout('shareLinkClick', e, target);

					if (!target.href) {
						return false;
					}

					if (target.hasAttribute('download')) {
						return true;
					}

					window.open(target.href, 'pswp_share', 'scrollbars=yes,resizable=yes,toolbar=no,' +
						'location=yes,width=550,height=420,top=100,left=' +
						(window.screen ? Math.round(screen.width / 2 - 275) : 100));

					if (!_shareModalHidden) {
						_toggleShareModal();
					}

					return false;
				},
				_updateShareURLs = function () {
					var shareButtonOut = '',
						shareButtonData,
						shareURL,
						image_url,
						page_url,
						share_text;

					for (var i = 0; i < _options.shareButtons.length; i++) {
						shareButtonData = _options.shareButtons[i];

						image_url = _options.getImageURLForShare(shareButtonData);
						page_url = _options.getPageURLForShare(shareButtonData);
						share_text = _options.getTextForShare(shareButtonData);

						shareURL = shareButtonData.url.replace('{{url}}', encodeURIComponent(page_url))
							.replace('{{image_url}}', encodeURIComponent(image_url))
							.replace('{{raw_image_url}}', image_url)
							.replace('{{text}}', encodeURIComponent(share_text));

						shareButtonOut += '<a href="' + shareURL + '" target="_blank" ' +
							'class="pswp__share--' + shareButtonData.id + '"' +
							(shareButtonData.download ? 'download' : '') + '>' +
							shareButtonData.label + '</a>';

						if (_options.parseShareButtonOut) {
							shareButtonOut = _options.parseShareButtonOut(shareButtonData, shareButtonOut);
						}
					}
					_shareModal.children[0].innerHTML = shareButtonOut;
					_shareModal.children[0].onclick = _openWindowPopup;

				},
				_hasCloseClass = function (target) {
					for (var i = 0; i < _options.closeElClasses.length; i++) {
						if (framework.hasClass(target, 'pswp__' + _options.closeElClasses[i])) {
							return true;
						}
					}
				},
				_idleInterval,
				_idleTimer,
				_idleIncrement = 0,
				_onIdleMouseMove = function () {
					clearTimeout(_idleTimer);
					_idleIncrement = 0;
					if (_isIdle) {
						ui.setIdle(false);
					}
				},
				_onMouseLeaveWindow = function (e) {
					e = e ? e : window.event;
					var from = e.relatedTarget || e.toElement;
					if (!from || from.nodeName === 'HTML') {
						clearTimeout(_idleTimer);
						_idleTimer = setTimeout(function () {
							ui.setIdle(true);
						}, _options.timeToIdleOutside);
					}
				},
				_setupFullscreenAPI = function () {
					if (_options.fullscreenEl && !framework.features.isOldAndroid) {
						if (!_fullscrenAPI) {
							_fullscrenAPI = ui.getFullscreenAPI();
						}
						if (_fullscrenAPI) {
							framework.bind(document, _fullscrenAPI.eventK, ui.updateFullscreen);
							ui.updateFullscreen();
							framework.addClass(pswp.template, 'pswp--supports-fs');
						} else {
							framework.removeClass(pswp.template, 'pswp--supports-fs');
						}
					}
				},
				_setupLoadingIndicator = function () {
					// Setup loading indicator
					if (_options.preloaderEl) {

						_toggleLoadingIndicator(true);

						_listen('beforeChange', function () {

							clearTimeout(_loadingIndicatorTimeout);

							// display loading indicator with delay
							_loadingIndicatorTimeout = setTimeout(function () {

								if (pswp.currItem && pswp.currItem.loading) {

									if (!pswp.allowProgressiveImg() || (pswp.currItem.img && !pswp.currItem.img.naturalWidth)) {
										// show preloader if progressive loading is not enabled, 
										// or image width is not defined yet (because of slow connection)
										_toggleLoadingIndicator(false);
										// items-controller.js function allowProgressiveImg
									}

								} else {
									_toggleLoadingIndicator(true); // hide preloader
								}

							}, _options.loadingIndicatorDelay);

						});
						_listen('imageLoadComplete', function (index, item) {
							if (pswp.currItem === item) {
								_toggleLoadingIndicator(true);
							}
						});

					}
				},
				_toggleLoadingIndicator = function (hide) {
					if (_loadingIndicatorHidden !== hide) {
						_togglePswpClass(_loadingIndicator, 'preloader--active', !hide);
						_loadingIndicatorHidden = hide;
					}
				},
				_applyNavBarGaps = function (item) {
					var gap = item.vGap;

					if (_fitControlsInViewport()) {

						var bars = _options.barsSize;
						if (_options.captionEl && bars.bottom === 'auto') {
							if (!_fakeCaptionContainer) {
								_fakeCaptionContainer = framework.createEl('pswp__caption pswp__caption--fake');
								_fakeCaptionContainer.appendChild(framework.createEl('pswp__caption__center'));
								_controls.insertBefore(_fakeCaptionContainer, _captionContainer);
								framework.addClass(_controls, 'pswp__ui--fit');
							}
							if (_options.addCaptionHTMLFn(item, _fakeCaptionContainer, true)) {

								var captionSize = _fakeCaptionContainer.clientHeight;
								gap.bottom = parseInt(captionSize, 10) || 44;
							} else {
								gap.bottom = bars.top; // if no caption, set size of bottom gap to size of top
							}
						} else {
							gap.bottom = bars.bottom === 'auto' ? 0 : bars.bottom;
						}

						// height of top bar is static, no need to calculate it
						gap.top = bars.top;
					} else {
						gap.top = gap.bottom = 0;
					}
				},
				_setupIdle = function () {
					// Hide controls when mouse is used
					if (_options.timeToIdle) {
						_listen('mouseUsed', function () {

							framework.bind(document, 'mousemove', _onIdleMouseMove);
							framework.bind(document, 'mouseout', _onMouseLeaveWindow);

							_idleInterval = setInterval(function () {
								_idleIncrement++;
								if (_idleIncrement === 2) {
									ui.setIdle(true);
								}
							}, _options.timeToIdle / 2);
						});
					}
				},
				_setupHidingControlsDuringGestures = function () {

					// Hide controls on vertical drag
					_listen('onVerticalDrag', function (now) {
						if (_controlsVisible && now < 0.95) {
							ui.hideControls();
						} else if (!_controlsVisible && now >= 0.95) {
							ui.showControls();
						}
					});

					// Hide controls when pinching to close
					var pinchControlsHidden;
					_listen('onPinchClose', function (now) {
						if (_controlsVisible && now < 0.9) {
							ui.hideControls();
							pinchControlsHidden = true;
						} else if (pinchControlsHidden && !_controlsVisible && now > 0.9) {
							ui.showControls();
						}
					});

					_listen('zoomGestureEnded', function () {
						pinchControlsHidden = false;
						if (pinchControlsHidden && !_controlsVisible) {
							ui.showControls();
						}
					});

				};



			var _uiElements = [
				{
					name: 'caption',
					option: 'captionEl',
					onInit: function (el) {
						_captionContainer = el;
					}
				},
				{
					name: 'share-modal',
					option: 'shareEl',
					onInit: function (el) {
						_shareModal = el;
					},
					onTap: function () {
						_toggleShareModal();
					}
				},
				{
					name: 'button--share',
					option: 'shareEl',
					onInit: function (el) {
						_shareButton = el;
					},
					onTap: function () {
						_toggleShareModal();
					}
				},
				{
					name: 'button--zoom',
					option: 'zoomEl',
					onTap: pswp.toggleDesktopZoom
				},
				{
					name: 'counter',
					option: 'counterEl',
					onInit: function (el) {
						_indexIndicator = el;
					}
				},
				{
					name: 'button--close',
					option: 'closeEl',
					onTap: pswp.close
				},
				{
					name: 'button--arrow--left',
					option: 'arrowEl',
					onTap: pswp.prev
				},
				{
					name: 'button--arrow--right',
					option: 'arrowEl',
					onTap: pswp.next
				},
				{
					name: 'button--close2',
					option: 'original',
					onTap: pswp.close
				},
				{
					name: 'button--fs',
					option: 'fullscreenEl',
					onTap: function () {
						if (_fullscrenAPI.isFullscreen()) {
							_fullscrenAPI.exit();
						} else {
							_fullscrenAPI.enter();
						}
					}
				},
				{
					name: 'preloader',
					option: 'preloaderEl',
					onInit: function (el) {
						_loadingIndicator = el;
					}
				}

			];

			var _setupUIElements = function () {
				var item,
					classAttr,
					uiElement;

				var loopThroughChildElements = function (sChildren) {
					if (!sChildren) {
						return;
					}

					var l = sChildren.length;
					for (var i = 0; i < l; i++) {
						item = sChildren[i];
						classAttr = item.className;

						for (var a = 0; a < _uiElements.length; a++) {
							uiElement = _uiElements[a];

							if (classAttr.indexOf('pswp__' + uiElement.name) > -1) {

								if (_options[uiElement.option]) { // if element is not disabled from options

									framework.removeClass(item, 'pswp__element--disabled');
									if (uiElement.onInit) {
										uiElement.onInit(item);
									}

									//item.style.display = 'block';
								} else {
									framework.addClass(item, 'pswp__element--disabled');
									//item.style.display = 'none';
								}
							}
						}
					}
				};
				loopThroughChildElements(_controls.children);

				var topBar = framework.getChildByClass(_controls, 'pswp__top-bar');
				if (topBar) {
					loopThroughChildElements(topBar.children);
				}
			};




			ui.init = function () {

				// extend options
				framework.extend(pswp.options, _defaultUIOptions, true);

				// create local link for fast access
				_options = pswp.options;

				// find pswp__ui element
				_controls = framework.getChildByClass(pswp.scrollWrap, 'pswp__ui');

				// create local link
				_listen = pswp.listen;


				_setupHidingControlsDuringGestures();

				// update controls when slides change
				_listen('beforeChange', ui.update);

				// toggle zoom on double-tap
				_listen('doubleTap', function (point) {
					var initialZoomLevel = pswp.currItem.initialZoomLevel;
					var currZoomLevel = pswp.currItem.currZoomLevel;
					if (pswp.getZoomLevel() !== initialZoomLevel) {
						if (currZoomLevel) {
							pswp.setZoom(currZoomLevel);
							pswp.currItem.initialZoomLevel = currZoomLevel;
							pswp.currItem.currZoomLevel = null;
						}
						pswp.zoomTo(initialZoomLevel, point, 333);
					} else {
						if (currZoomLevel) {
							pswp.setZoom(currZoomLevel);
							pswp.currItem.initialPosition.x = pswp.currItem.initialPosition.x * pswp.currItem.initialZoomLevel / currZoomLevel;
							pswp.currItem.initialPosition.y = pswp.currItem.initialPosition.y * pswp.currItem.initialZoomLevel / currZoomLevel;
							pswp.currItem.fitRatio = currZoomLevel;
							pswp.currItem.initialZoomLevel = currZoomLevel;
							pswp.currItem.currZoomLevel = null;
						}
						
						pswp.zoomTo(_options.getDoubleTapZoom(false, pswp.currItem), point, 333);
					}
				});

				// Allow text selection in caption
				_listen('preventDragEvent', function (e, isDown, preventObj) {
					var t = e.target || e.srcElement;
					if (
						t &&
						t.getAttribute('class') && e.type.indexOf('mouse') > -1 &&
						(t.getAttribute('class').indexOf('__caption') > 0 || (/(SMALL|STRONG|EM)/i).test(t.tagName))
					) {
						preventObj.prevent = false;
					}
				});

				// bind events for UI
				_listen('bindEvents', function () {
					framework.bind(_controls, 'pswpTap click', _onControlsTap);
					framework.bind(pswp.scrollWrap, 'pswpTap', ui.onGlobalTap);

					if (!pswp.likelyTouchDevice) {
						framework.bind(pswp.scrollWrap, 'mouseover', ui.onMouseOver);
					}
				});

				// unbind events for UI
				_listen('unbindEvents', function () {
					if (!_shareModalHidden) {
						_toggleShareModal();
					}

					if (_idleInterval) {
						clearInterval(_idleInterval);
					}
					framework.unbind(document, 'mouseout', _onMouseLeaveWindow);
					framework.unbind(document, 'mousemove', _onIdleMouseMove);
					framework.unbind(_controls, 'pswpTap click', _onControlsTap);
					framework.unbind(pswp.scrollWrap, 'pswpTap', ui.onGlobalTap);
					framework.unbind(pswp.scrollWrap, 'mouseover', ui.onMouseOver);

					if (_fullscrenAPI) {
						framework.unbind(document, _fullscrenAPI.eventK, ui.updateFullscreen);
						if (_fullscrenAPI.isFullscreen()) {
							_options.hideAnimationDuration = 0;
							_fullscrenAPI.exit();
						}
						_fullscrenAPI = null;
					}
				});


				// clean up things when gallery is destroyed
				_listen('destroy', function () {
					if (_options.captionEl) {
						if (_fakeCaptionContainer) {
							_controls.removeChild(_fakeCaptionContainer);
						}
						framework.removeClass(_captionContainer, 'pswp__caption--empty');
					}

					if (_shareModal) {
						_shareModal.children[0].onclick = null;
					}
					framework.removeClass(_controls, 'pswp__ui--over-close');
					framework.addClass(_controls, 'pswp__ui--hidden');
					ui.setIdle(false);
				});


				if (!_options.showAnimationDuration) {
					framework.removeClass(_controls, 'pswp__ui--hidden');
				}
				_listen('initialZoomIn', function () {
					if (_options.showAnimationDuration) {
						if (window.innerWidth < 750 && window.innerWidth > window.innerHeight) {
							_controlsVisible = false;
						} else {
							framework.removeClass(_controls, 'pswp__ui--hidden');
						}
					}
				});
				_listen('initialZoomOut', function () {
					framework.addClass(_controls, 'pswp__ui--hidden');
				});

				_listen('parseVerticalMargin', _applyNavBarGaps);

				_setupUIElements();

				if (_options.shareEl && _shareButton && _shareModal) {
					_shareModalHidden = true;
				}

				_countNumItems();

				_setupIdle();

				_setupFullscreenAPI();

				_setupLoadingIndicator();
			};

			ui.setIdle = function (isIdle) {
				_isIdle = isIdle;
				_togglePswpClass(_controls, 'ui--idle', isIdle);
			};

			ui.update = function () {
				// Don't update UI if it's hidden
				if (_controlsVisible && pswp.currItem) {

					ui.updateIndexIndicator();

					if (_options.captionEl) {
						_options.addCaptionHTMLFn(pswp.currItem, _captionContainer);
						_togglePswpClass(_captionContainer, 'caption--empty', !pswp.currItem.title);
					}

					_overlayUIUpdated = true;

				} else {
					_overlayUIUpdated = false;
				}

				if (!_shareModalHidden) {
					_toggleShareModal();
				}

				_countNumItems();
			};

			ui.updateFullscreen = function (e) {

				if (e) {
					// some browsers change window scroll position during the fullscreen
					// so PhotoSwipe updates it just in case
					setTimeout(function () {
						pswp.setScrollOffset(0, framework.getScrollY());
					}, 50);
				}

				// toogle pswp--fs class on root element
				framework[(_fullscrenAPI.isFullscreen() ? 'add' : 'remove') + 'Class'](pswp.template, 'pswp--fs');
			};

			ui.updateIndexIndicator = function () {
				if (_options.counterEl) {
					_indexIndicator.innerHTML = (pswp.getCurrentIndex() + 1) +
						_options.indexIndicatorSep +
						_options.getNumItemsFn();
				}
			};

			ui.onGlobalTap = function (e) {
				e = e || window.event;
				var target = e.target || e.srcElement;

				if (_blockControlsTap) {
					return;
				}

				if (e.detail && e.detail.pointerType === 'mouse') {

					// close gallery if clicked outside of the image
					if (_hasCloseClass(target)) {
						pswp.close();
						return;
					}

					if (framework.hasClass(target, 'pswp__img')) {
						if (pswp.getZoomLevel() === 1 && pswp.getZoomLevel() <= pswp.currItem.fitRatio) {
							if (_options.clickToCloseNonZoomable) {
								pswp.close();
							}
						} else {
							pswp.toggleDesktopZoom(e.detail.releasePoint);
						}
					}

				} else {

					// tap anywhere (except buttons) to toggle visibility of controls
					if (_options.tapToToggleControls) {
						if (_controlsVisible) {
							ui.hideControls();
						} else {
							ui.showControls();
						}
					}

					// tap to close gallery
					if (_options.tapToClose && (framework.hasClass(target, 'pswp__img') || _hasCloseClass(target))) {
						pswp.close();
						return;
					}

				}
			};
			ui.onMouseOver = function (e) {
				e = e || window.event;
				var target = e.target || e.srcElement;

				// add class when mouse is over an element that should close the gallery
				_togglePswpClass(_controls, 'ui--over-close', _hasCloseClass(target));
			};

			ui.hideControls = function () {
				framework.addClass(_controls, 'pswp__ui--hidden');
				_controlsVisible = false;
			};

			ui.showControls = function () {
				_controlsVisible = true;
				if (!_overlayUIUpdated) {
					ui.update();
				}
				framework.removeClass(_controls, 'pswp__ui--hidden');
			};

			ui.supportsFullscreen = function () {
				var d = document;
				return !!(d.exitFullscreen || d.mozCancelFullScreen || d.webkitExitFullscreen || d.msExitFullscreen);
			};

			ui.getFullscreenAPI = function () {
				var dE = document.documentElement,
					api,
					tF = 'fullscreenchange';

				if (dE.requestFullscreen) {
					api = {
						enterK: 'requestFullscreen',
						exitK: 'exitFullscreen',
						elementK: 'fullscreenElement',
						eventK: tF
					};

				} else if (dE.mozRequestFullScreen) {
					api = {
						enterK: 'mozRequestFullScreen',
						exitK: 'mozCancelFullScreen',
						elementK: 'mozFullScreenElement',
						eventK: 'moz' + tF
					};



				} else if (dE.webkitRequestFullscreen) {
					api = {
						enterK: 'webkitRequestFullscreen',
						exitK: 'webkitExitFullscreen',
						elementK: 'webkitFullscreenElement',
						eventK: 'webkit' + tF
					};

				} else if (dE.msRequestFullscreen) {
					api = {
						enterK: 'msRequestFullscreen',
						exitK: 'msExitFullscreen',
						elementK: 'msFullscreenElement',
						eventK: 'MSFullscreenChange'
					};
				}

				if (api) {
					api.enter = function () {
						// disable close-on-scroll in fullscreen
						_initalCloseOnScrollValue = _options.closeOnScroll;
						_options.closeOnScroll = false;

						if (this.enterK === 'webkitRequestFullscreen') {
							pswp.template[this.enterK](Element.ALLOW_KEYBOARD_INPUT);
						} else {
							return pswp.template[this.enterK]();
						}
					};
					api.exit = function () {
						_options.closeOnScroll = _initalCloseOnScrollValue;

						return document[this.exitK]();

					};
					api.isFullscreen = function () { return document[this.elementK]; };
				}

				return api;
			};



		};
	return PhotoSwipeUI_Default;


});
